If XN is the dominant allele for normal vision and Xn the...
If XN is the dominant allele for normal vision and Xn the recessive allele for colour blindness, a boy with the genotype YXn will be
have normal vision
be colour-blind
be totally blind
be a carrier of colour blindness
Correct answer is D
The boy is a carrier because Xn is the recessive allele for colour blindness.
Plants that grow under average temperature and moisture are called ...
How many nuclei are found in pollen tube during fertilization? ...
The part labelled j is called ...
The function of the part labelled V is for the passage of ...
Which of the following relationships illustrates competition? ...
Which of the following statements about mitosis is not correct? ...
Which of these is a limiting factor with respect to human population size? ...